Question

这种方法删除了随机单元格，但不是我想要的单元格。我认为问题在于使用indexPath初始化按钮，我不知道如何修复它。

如果我没弄错，indexPath.item表示UICollectionView中的一行。那么bug在哪里？

extension UIButton {

    struct Holder {
        static var _myComputedProperty:IndexPath!
    }
    var indexPath:IndexPath {
        get {
            return Holder._myComputedProperty
        }
        set(newValue) {
            Holder._myComputedProperty = newValue
        }
    }
}

public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return arrRequest.count
}

public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! RequestCell
    cell.delete.indexPath = indexPath
    cell.delete.addTarget(nil, action: #selector(del(sender:)), for: .touchUpInside)

    return cell
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: collectionView.frame.width, height: 235)
}

@objc func del(sender: UIButton) {

    arrRequest.remove(at: sender.indexPath.item)

    self.collectionView.performBatchUpdates({
        self.collectionView.deleteItems(at: [sender.indexPath])
    }) { (finished) in
        self.collectionView.reloadItems(at: self.collectionView.indexPathsForVisibleItems)
    } 
}

Answer 1

请更改您的代码，如下所示

public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! RequestCell
    cell.delete.tag = index path.row
    cell.delete.addTarget(nil, action: #selector(del(sender:)), for: .touchUpInside)

    return cell
}

您的删除方法如下：

@objc func del(sender: UIButton) {

let indexPath = IndexPath(item: sender.tag, section: 0)

    arrRequest.remove(at: indexPath)

    self.collectionView.performBatchUpdates({
        self.collectionView.deleteItems(at: [indexPath])
    }) { (finished) in
        self.collectionView.reloadItems(at: self.collectionView.indexPathsForVisibleItems)
    } 
}

通过自定义按钮删除UICollectionViewCell

1 个答案: